I couldn't find a definitive answer. However, as I remember the 50s, religion grown may have occurred because of the dynamism of tv preachers or perhaps a desire to combat communism and be a "good" American.

The growing impact of television and the rise of youth culture led many social critics to charge that America was becoming homogenized, conformist society. By 1960, about 30.5% of Americans, or 55 million out of 180 million, lived in suburbs. Stereotypical images of suburbia supported the view that the nation was becoming conformist: Levittown houses, housewives raising children at home, husbands struggling their way up the corporate ladder, backyard barbecues. Critics also believed that the growth of non-denominational churches indicated that religion was becoming a thing of the past in America.

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